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Increase raid456 stripe cache size if needed to --grow the array.
[thirdparty/mdadm.git] / Grow.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29 #include "mdadm.h"
30 #include "dlink.h"
31
32 #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
33 #error no endian defined
34 #endif
35 #include "md_u.h"
36 #include "md_p.h"
37
38 int Grow_Add_device(char *devname, int fd, char *newdev)
39 {
40 /* Add a device to an active array.
41 * Currently, just extend a linear array.
42 * This requires writing a new superblock on the
43 * new device, calling the kernel to add the device,
44 * and if that succeeds, update the superblock on
45 * all other devices.
46 * This means that we need to *find* all other devices.
47 */
48 struct mdinfo info;
49
50 void *super = NULL;
51 struct stat stb;
52 int nfd, fd2;
53 int d, nd;
54 struct supertype *st = NULL;
55
56
57 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
58 fprintf(stderr, Name ": cannot get array info for %s\n", devname);
59 return 1;
60 }
61
62 st = super_by_version(info.array.major_version, info.array.minor_version);
63 if (!st) {
64 fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version);
65 return 1;
66 }
67
68 if (info.array.level != -1) {
69 fprintf(stderr, Name ": can only add devices to linear arrays\n");
70 return 1;
71 }
72
73 nfd = open(newdev, O_RDWR|O_EXCL);
74 if (nfd < 0) {
75 fprintf(stderr, Name ": cannot open %s\n", newdev);
76 return 1;
77 }
78 fstat(nfd, &stb);
79 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
80 fprintf(stderr, Name ": %s is not a block device!\n", newdev);
81 close(nfd);
82 return 1;
83 }
84 /* now check out all the devices and make sure we can read the superblock */
85 for (d=0 ; d < info.array.raid_disks ; d++) {
86 mdu_disk_info_t disk;
87 char *dv;
88
89 disk.number = d;
90 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
91 fprintf(stderr, Name ": cannot get device detail for device %d\n",
92 d);
93 return 1;
94 }
95 dv = map_dev(disk.major, disk.minor, 1);
96 if (!dv) {
97 fprintf(stderr, Name ": cannot find device file for device %d\n",
98 d);
99 return 1;
100 }
101 fd2 = dev_open(dv, O_RDWR);
102 if (!fd2) {
103 fprintf(stderr, Name ": cannot open device file %s\n", dv);
104 return 1;
105 }
106 if (super) free(super);
107 super= NULL;
108 if (st->ss->load_super(st, fd2, &super, NULL)) {
109 fprintf(stderr, Name ": cannot find super block on %s\n", dv);
110 close(fd2);
111 return 1;
112 }
113 close(fd2);
114 }
115 /* Ok, looks good. Lets update the superblock and write it out to
116 * newdev.
117 */
118
119 info.disk.number = d;
120 info.disk.major = major(stb.st_rdev);
121 info.disk.minor = minor(stb.st_rdev);
122 info.disk.raid_disk = d;
123 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
124 st->ss->update_super(&info, super, "grow", newdev, 0, 0, NULL);
125
126 if (st->ss->store_super(st, nfd, super)) {
127 fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev);
128 close(nfd);
129 return 1;
130 }
131 close(nfd);
132
133 if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
134 fprintf(stderr, Name ": Cannot add new disk to this array\n");
135 return 1;
136 }
137 /* Well, that seems to have worked.
138 * Now go through and update all superblocks
139 */
140
141 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
142 fprintf(stderr, Name ": cannot get array info for %s\n", devname);
143 return 1;
144 }
145
146 nd = d;
147 for (d=0 ; d < info.array.raid_disks ; d++) {
148 mdu_disk_info_t disk;
149 char *dv;
150
151 disk.number = d;
152 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
153 fprintf(stderr, Name ": cannot get device detail for device %d\n",
154 d);
155 return 1;
156 }
157 dv = map_dev(disk.major, disk.minor, 1);
158 if (!dv) {
159 fprintf(stderr, Name ": cannot find device file for device %d\n",
160 d);
161 return 1;
162 }
163 fd2 = dev_open(dv, O_RDWR);
164 if (fd2 < 0) {
165 fprintf(stderr, Name ": cannot open device file %s\n", dv);
166 return 1;
167 }
168 if (st->ss->load_super(st, fd2, &super, NULL)) {
169 fprintf(stderr, Name ": cannot find super block on %s\n", dv);
170 close(fd);
171 return 1;
172 }
173 info.array.raid_disks = nd+1;
174 info.array.nr_disks = nd+1;
175 info.array.active_disks = nd+1;
176 info.array.working_disks = nd+1;
177 info.disk.number = nd;
178 info.disk.major = major(stb.st_rdev);
179 info.disk.minor = minor(stb.st_rdev);
180 info.disk.raid_disk = nd;
181 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
182 st->ss->update_super(&info, super, "grow", dv, 0, 0, NULL);
183
184 if (st->ss->store_super(st, fd2, super)) {
185 fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
186 close(fd2);
187 return 1;
188 }
189 close(fd2);
190 }
191
192 return 0;
193 }
194
195 int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind, int force)
196 {
197 /*
198 * First check that array doesn't have a bitmap
199 * Then create the bitmap
200 * Then add it
201 *
202 * For internal bitmaps, we need to check the version,
203 * find all the active devices, and write the bitmap block
204 * to all devices
205 */
206 mdu_bitmap_file_t bmf;
207 mdu_array_info_t array;
208 struct supertype *st;
209 int major = BITMAP_MAJOR_HI;
210 int vers = md_get_version(fd);
211 unsigned long long bitmapsize, array_size;
212
213 if (vers < 9003) {
214 major = BITMAP_MAJOR_HOSTENDIAN;
215 #ifdef __BIG_ENDIAN
216 fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
217 " between different architectured. Consider upgrading the Linux kernel.\n");
218 #endif
219 }
220
221 if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
222 if (errno == ENOMEM)
223 fprintf(stderr, Name ": Memory allocation failure.\n");
224 else
225 fprintf(stderr, Name ": bitmaps not supported by this kernel.\n");
226 return 1;
227 }
228 if (bmf.pathname[0]) {
229 if (strcmp(file,"none")==0) {
230 if (ioctl(fd, SET_BITMAP_FILE, -1)!= 0) {
231 fprintf(stderr, Name ": failed to remove bitmap %s\n",
232 bmf.pathname);
233 return 1;
234 }
235 return 0;
236 }
237 fprintf(stderr, Name ": %s already has a bitmap (%s)\n",
238 devname, bmf.pathname);
239 return 1;
240 }
241 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
242 fprintf(stderr, Name ": cannot get array status for %s\n", devname);
243 return 1;
244 }
245 if (array.state & (1<<MD_SB_BITMAP_PRESENT)) {
246 if (strcmp(file, "none")==0) {
247 array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
248 if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
249 fprintf(stderr, Name ": failed to remove internal bitmap.\n");
250 return 1;
251 }
252 return 0;
253 }
254 fprintf(stderr, Name ": Internal bitmap already present on %s\n",
255 devname);
256 return 1;
257 }
258 bitmapsize = array.size;
259 bitmapsize <<= 1;
260 #ifdef BLKGETSIZE64
261 if (ioctl(fd, BLKGETSIZE64, &array_size) == 0 &&
262 array_size > (0x7fffffffULL<<9)) {
263 /* Array is big enough that we cannot trust array.size
264 * try other approaches
265 */
266 bitmapsize = get_component_size(fd);
267 }
268 #endif
269 if (bitmapsize == 0) {
270 fprintf(stderr, Name ": Cannot reliably determine size of array to create bitmap - sorry.\n");
271 return 1;
272 }
273
274 if (array.level == 10) {
275 int ncopies = (array.layout&255)*((array.layout>>8)&255);
276 bitmapsize = bitmapsize * array.raid_disks / ncopies;
277 }
278
279 st = super_by_version(array.major_version, array.minor_version);
280 if (!st) {
281 fprintf(stderr, Name ": Cannot understand version %d.%d\n",
282 array.major_version, array.minor_version);
283 return 1;
284 }
285 if (strcmp(file, "none") == 0) {
286 fprintf(stderr, Name ": no bitmap found on %s\n", devname);
287 return 1;
288 } else if (strcmp(file, "internal") == 0) {
289 int d;
290 for (d=0; d< st->max_devs; d++) {
291 mdu_disk_info_t disk;
292 char *dv;
293 disk.number = d;
294 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
295 continue;
296 if (disk.major == 0 &&
297 disk.minor == 0)
298 continue;
299 if ((disk.state & (1<<MD_DISK_SYNC))==0)
300 continue;
301 dv = map_dev(disk.major, disk.minor, 1);
302 if (dv) {
303 void *super;
304 int fd2 = dev_open(dv, O_RDWR);
305 if (fd2 < 0)
306 continue;
307 if (st->ss->load_super(st, fd2, &super, NULL)==0) {
308 if (st->ss->add_internal_bitmap(
309 st, super,
310 &chunk, delay, write_behind,
311 bitmapsize, 0, major)
312 )
313 st->ss->write_bitmap(st, fd2, super);
314 else {
315 fprintf(stderr, Name ": failed to create internal bitmap - chunksize problem.\n");
316 close(fd2);
317 return 1;
318 }
319 }
320 close(fd2);
321 }
322 }
323 array.state |= (1<<MD_SB_BITMAP_PRESENT);
324 if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
325 fprintf(stderr, Name ": failed to set internal bitmap.\n");
326 return 1;
327 }
328 } else {
329 int uuid[4];
330 int bitmap_fd;
331 int d;
332 int max_devs = st->max_devs;
333 void *super = NULL;
334
335 /* try to load a superblock */
336 for (d=0; d<max_devs; d++) {
337 mdu_disk_info_t disk;
338 char *dv;
339 int fd2;
340 disk.number = d;
341 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
342 continue;
343 if ((disk.major==0 && disk.minor==0) ||
344 (disk.state & (1<<MD_DISK_REMOVED)))
345 continue;
346 dv = map_dev(disk.major, disk.minor, 1);
347 if (!dv) continue;
348 fd2 = dev_open(dv, O_RDONLY);
349 if (fd2 >= 0 &&
350 st->ss->load_super(st, fd2, &super, NULL) == 0) {
351 close(fd2);
352 st->ss->uuid_from_super(uuid, super);
353 break;
354 }
355 close(fd2);
356 }
357 if (d == max_devs) {
358 fprintf(stderr, Name ": cannot find UUID for array!\n");
359 return 1;
360 }
361 if (CreateBitmap(file, force, (char*)uuid, chunk,
362 delay, write_behind, bitmapsize, major)) {
363 return 1;
364 }
365 bitmap_fd = open(file, O_RDWR);
366 if (bitmap_fd < 0) {
367 fprintf(stderr, Name ": weird: %s cannot be opened\n",
368 file);
369 return 1;
370 }
371 if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
372 fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
373 devname, strerror(errno));
374 return 1;
375 }
376 }
377
378 return 0;
379 }
380
381
382 /*
383 * When reshaping an array we might need to backup some data.
384 * This is written to all spares with a 'super_block' describing it.
385 * The superblock goes 1K form the end of the used space on the
386 * device.
387 * It if written after the backup is complete.
388 * It has the following structure.
389 */
390
391 struct mdp_backup_super {
392 char magic[16]; /* md_backup_data-1 */
393 __u8 set_uuid[16];
394 __u64 mtime;
395 /* start/sizes in 512byte sectors */
396 __u64 devstart;
397 __u64 arraystart;
398 __u64 length;
399 __u32 sb_csum; /* csum of preceeding bytes. */
400 };
401
402 int bsb_csum(char *buf, int len)
403 {
404 int i;
405 int csum = 0;
406 for (i=0; i<len; i++)
407 csum = (csum<<3) + buf[0];
408 return __cpu_to_le32(csum);
409 }
410
411 int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
412 long long size,
413 int level, int layout, int chunksize, int raid_disks)
414 {
415 /* Make some changes in the shape of an array.
416 * The kernel must support the change.
417 * Different reshapes have subtly different meaning for different
418 * levels, so we need to check the current state of the array
419 * and go from there.
420 */
421 struct mdu_array_info_s array;
422 char *c;
423
424 struct mdp_backup_super bsb;
425 struct supertype *st;
426
427 int nlevel, olevel;
428 int nchunk, ochunk;
429 int nlayout, olayout;
430 int ndisks, odisks;
431 int ndata, odata;
432 unsigned long long nstripe, ostripe, last_block;
433 int *fdlist;
434 unsigned long long *offsets;
435 int d, i, spares;
436 int nrdisks;
437 int err;
438 void *super = NULL;
439
440 struct sysarray *sra;
441 struct sysdev *sd;
442
443 if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
444 fprintf(stderr, Name ": %s is not an active md array - aborting\n",
445 devname);
446 return 1;
447 }
448 c = map_num(pers, array.level);
449 if (c == NULL) c = "-unknown-";
450 switch(array.level) {
451 default: /* raid0, linear, multipath cannot be reconfigured */
452 fprintf(stderr, Name ": %s array %s cannot be reshaped.\n",
453 c, devname);
454 return 1;
455
456 case LEVEL_FAULTY: /* only 'layout' change is permitted */
457
458 if (size >= 0) {
459 fprintf(stderr, Name ": %s: Cannot change size of a 'faulty' array\n",
460 devname);
461 return 1;
462 }
463 if (level != UnSet && level != LEVEL_FAULTY) {
464 fprintf(stderr, Name ": %s: Cannot change RAID level of a 'faulty' array\n",
465 devname);
466 return 1;
467 }
468 if (chunksize || raid_disks) {
469 fprintf(stderr, Name ": %s: Cannot change chunksize or disks of a 'faulty' array\n",
470 devname);
471 return 1;
472 }
473 if (layout == UnSet)
474 return 0; /* nothing to do.... */
475
476 array.layout = layout;
477 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
478 fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
479 devname, strerror(errno));
480 return 1;
481 }
482 if (!quiet)
483 printf("layout for %s set to %d\n", devname, array.layout);
484 return 0;
485
486 case 1: /* raid_disks and size can each be changed. They are independant */
487
488 if (level != UnSet && level != 1) {
489 fprintf(stderr, Name ": %s: Cannot change RAID level of a RAID1 array.\n",
490 devname);
491 return 1;
492 }
493 if (chunksize || layout != UnSet) {
494 fprintf(stderr, Name ": %s: Cannot change chunk size of layout for a RAID1 array.\n",
495 devname);
496 return 1;
497 }
498
499 /* Each can trigger a resync/recovery which will block the
500 * other from happening. Later we could block
501 * resync for the duration via 'sync_action'...
502 */
503 if (raid_disks > 0) {
504 array.raid_disks = raid_disks;
505 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
506 fprintf(stderr, Name ": Cannot set raid-devices for %s: %s\n",
507 devname, strerror(errno));
508 return 1;
509 }
510 }
511 if (size >= 0) {
512 array.size = size;
513 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
514 fprintf(stderr, Name ": Cannot set device size for %s: %s\n",
515 devname, strerror(errno));
516 return 1;
517 }
518 }
519 return 0;
520
521 case 4:
522 case 5:
523 case 6:
524 st = super_by_version(array.major_version,
525 array.minor_version);
526 /* size can be changed independently.
527 * layout/chunksize/raid_disks/level can be changed
528 * though the kernel may not support it all.
529 * If 'suspend_lo' is not present in devfs, then
530 * these cannot be changed.
531 */
532 if (size >= 0) {
533 /* Cannot change other details as well.. */
534 if (layout != UnSet ||
535 chunksize != 0 ||
536 raid_disks != 0 ||
537 level != UnSet) {
538 fprintf(stderr, Name ": %s: Cannot change shape as well as size of a %s array.\n",
539 devname, c);
540 return 1;
541 }
542 array.size = size;
543 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
544 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
545 devname, strerror(errno));
546 return 1;
547 }
548 return 0;
549 }
550 /* Ok, just change the shape. This can be awkward.
551 * There are three possibilities.
552 * 1/ The array will shrink. We don't support this
553 * possibility. Maybe one day...
554 * 2/ The array will not change size. This is easy enough
555 * to do, but not reliably. If the process is aborted
556 * the array *will* be corrupted. So maybe we can allow
557 * this but only if the user is really certain. e.g.
558 * --really-risk-everything
559 * 3/ The array will grow. This can be reliably achieved.
560 * However the kernel's restripe routines will cheerfully
561 * overwrite some early data before it is safe. So we
562 * need to make a backup of the early parts of the array
563 * and be ready to restore it if rebuild aborts very early.
564 *
565 * We backup data by writing it to all spares (there must be
566 * at least 1, so even raid6->raid5 requires a spare to be
567 * present).
568 *
569 * So: we enumerate the devices in the array and
570 * make sure we can open all of them.
571 * Then we freeze the early part of the array and
572 * backup to the various spares.
573 * Then we request changes and start the reshape.
574 * Monitor progress until it has passed the danger zone.
575 * and finally invalidate the copied data and unfreeze the
576 * start of the array.
577 *
578 * Before we can do this we need to decide:
579 * - will the array grow? Just calculate size
580 * - how much needs to be saved: count stripes.
581 * - where to save data... good question.
582 *
583 */
584 nlevel = olevel = array.level;
585 nchunk = ochunk = array.chunk_size;
586 nlayout = olayout = array.layout;
587 ndisks = odisks = array.raid_disks;
588
589 if (level != UnSet) nlevel = level;
590 if (chunksize) nchunk = chunksize;
591 if (layout != UnSet) nlayout = layout;
592 if (raid_disks) ndisks = raid_disks;
593
594 odata = odisks-1;
595 if (olevel == 6) odata--; /* number of data disks */
596 ndata = ndisks-1;
597 if (nlevel == 6) ndata--;
598
599 if (ndata < odata) {
600 fprintf(stderr, Name ": %s: Cannot reduce number of data disks (yet).\n",
601 devname);
602 return 1;
603 }
604 if (ndata == odata) {
605 fprintf(stderr, Name ": %s: Cannot reshape array without increasing size (yet).\n",
606 devname);
607 return 1;
608 }
609 /* Well, it is growing... so how much do we need to backup.
610 * Need to backup a full number of new-stripes, such that the
611 * last one does not over-write any place that it would be read
612 * from
613 */
614 nstripe = ostripe = 0;
615 while (nstripe >= ostripe) {
616 nstripe += nchunk/512;
617 last_block = nstripe * ndata;
618 ostripe = last_block / odata / (ochunk/512) * (ochunk/512);
619 }
620 printf("mdadm: Need to backup %lluK of critical section..\n", last_block/2);
621
622 sra = sysfs_read(fd, 0,
623 GET_COMPONENT|GET_DEVS|GET_OFFSET|GET_STATE|
624 GET_CACHE);
625 if (!sra) {
626 fprintf(stderr, Name ": %s: Cannot get array details from sysfs\n",
627 devname);
628 return 1;
629 }
630
631 if (last_block >= sra->component_size/2) {
632 fprintf(stderr, Name ": %s: Something wrong - reshape aborted\n",
633 devname);
634 return 1;
635 }
636 if (sra->spares == 0 && backup_file == NULL) {
637 fprintf(stderr, Name ": %s: Cannot grow - need a spare or backup-file to backup critical section\n",
638 devname);
639 return 1;
640 }
641
642 nrdisks = array.nr_disks + sra->spares;
643 /* Now we need to open all these devices so we can read/write.
644 */
645 fdlist = malloc((1+nrdisks) * sizeof(int));
646 offsets = malloc((1+nrdisks) * sizeof(offsets[0]));
647 if (!fdlist || !offsets) {
648 fprintf(stderr, Name ": malloc failed: grow aborted\n");
649 return 1;
650 }
651 for (d=0; d <= nrdisks; d++)
652 fdlist[d] = -1;
653 d = array.raid_disks;
654 for (sd = sra->devs; sd; sd=sd->next) {
655 if (sd->state & (1<<MD_DISK_FAULTY))
656 continue;
657 if (sd->state & (1<<MD_DISK_SYNC)) {
658 char *dn = map_dev(sd->major, sd->minor, 1);
659 fdlist[sd->role] = dev_open(dn, O_RDONLY);
660 offsets[sd->role] = sd->offset;
661 if (fdlist[sd->role] < 0) {
662 fprintf(stderr, Name ": %s: cannot open component %s\n",
663 devname, dn?dn:"-unknown-");
664 goto abort;
665 }
666 } else {
667 /* spare */
668 char *dn = map_dev(sd->major, sd->minor, 1);
669 fdlist[d] = dev_open(dn, O_RDWR);
670 offsets[d] = sd->offset;
671 if (fdlist[d]<0) {
672 fprintf(stderr, Name ": %s: cannot open component %s\n",
673 devname, dn?dn:"-unknown");
674 goto abort;
675 }
676 d++;
677 }
678 }
679 for (i=0 ; i<array.raid_disks; i++)
680 if (fdlist[i] < 0) {
681 fprintf(stderr, Name ": %s: failed to find device %d. Array might be degraded.\n"
682 " --grow aborted\n", devname, i);
683 goto abort;
684 }
685 spares = sra->spares;
686 if (backup_file) {
687 fdlist[d] = open(backup_file, O_RDWR|O_CREAT|O_EXCL, 0600);
688 if (fdlist[d] < 0) {
689 fprintf(stderr, Name ": %s: cannot create backup file %s: %s\n",
690 devname, backup_file, strerror(errno));
691 goto abort;
692 }
693 offsets[d] = 8;
694 d++;
695 spares++;
696 }
697 if (fdlist[array.raid_disks] < 0) {
698 fprintf(stderr, Name ": %s: failed to find a spare and no backup-file given - --grow aborted\n",
699 devname);
700 goto abort;
701 }
702
703 /* Find a superblock */
704 if (st->ss->load_super(st, fdlist[0], &super, NULL)) {
705 fprintf(stderr, Name ": %s: Cannot find a superblock\n",
706 devname);
707 goto abort;
708 }
709
710
711 memcpy(bsb.magic, "md_backup_data-1", 16);
712 st->ss->uuid_from_super((int*)&bsb.set_uuid, super);
713 bsb.mtime = __cpu_to_le64(time(0));
714 bsb.arraystart = 0;
715 bsb.length = __cpu_to_le64(last_block);
716
717 /* Decide offset for the backup, llseek the spares, and write
718 * a leading superblock 4K earlier.
719 */
720 for (i=array.raid_disks; i<d; i++) {
721 char buf[4096];
722 if (i==d-1 && backup_file) {
723 /* This is the backup file */
724 offsets[i] = 8;
725 } else
726 offsets[i] += sra->component_size - last_block - 8;
727 if (lseek64(fdlist[i], (offsets[i]<<9) - 4096, 0)
728 != (offsets[i]<<9) - 4096) {
729 fprintf(stderr, Name ": could not seek...\n");
730 goto abort;
731 }
732 memset(buf, 0, sizeof(buf));
733 bsb.devstart = __cpu_to_le64(offsets[i]);
734 bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
735 memcpy(buf, &bsb, sizeof(bsb));
736 if (write(fdlist[i], buf, 4096) != 4096) {
737 fprintf(stderr, Name ": could not write leading superblock\n");
738 goto abort;
739 }
740 }
741 array.level = nlevel;
742 array.raid_disks = ndisks;
743 array.chunk_size = nchunk;
744 array.layout = nlayout;
745 if (ioctl(fd, SET_ARRAY_INFO, &array) != 0) {
746 if (errno == ENOSPC) {
747 /* stripe cache is not big enough.
748 * It needs to be 4 times chunksize_size,
749 * and we assume pagesize is 4K
750 */
751 if (sra->cache_size < 4 * (nchunk/4096)) {
752 sysfs_set_num(sra, NULL,
753 "stripe_cache_size",
754 4 * (nchunk/4096) +1);
755 if (ioctl(fd, SET_ARRAY_INFO,
756 &array) == 0)
757 goto ok;
758 }
759 }
760 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
761 devname, strerror(errno));
762 goto abort;
763 }
764 ok: ;
765
766 /* suspend the relevant region */
767 sysfs_set_num(sra, NULL, "suspend_hi", 0); /* just in case */
768 if (sysfs_set_num(sra, NULL, "suspend_lo", 0) < 0 ||
769 sysfs_set_num(sra, NULL, "suspend_hi", last_block) < 0) {
770 fprintf(stderr, Name ": %s: failed to suspend device.\n",
771 devname);
772 goto abort_resume;
773 }
774
775
776 err = save_stripes(fdlist, offsets,
777 odisks, ochunk, olevel, olayout,
778 spares, fdlist+odisks,
779 0ULL, last_block*512);
780
781 /* abort if there was an error */
782 if (err < 0) {
783 fprintf(stderr, Name ": %s: failed to save critical region\n",
784 devname);
785 goto abort_resume;
786 }
787
788 for (i=odisks; i<d ; i++) {
789 bsb.devstart = __cpu_to_le64(offsets[i]);
790 bsb.sb_csum = bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb));
791 if (lseek64(fdlist[i], (offsets[i]+last_block)<<9, 0) < 0 ||
792 write(fdlist[i], &bsb, sizeof(bsb)) != sizeof(bsb) ||
793 fsync(fdlist[i]) != 0) {
794 fprintf(stderr, Name ": %s: fail to save metadata for critical region backups.\n",
795 devname);
796 goto abort_resume;
797 }
798 }
799
800 /* start the reshape happening */
801 if (sysfs_set_str(sra, NULL, "sync_action", "reshape") < 0) {
802 fprintf(stderr, Name ": %s: failed to initiate reshape\n",
803 devname);
804 goto abort_resume;
805 }
806 /* wait for reshape to pass the critical region */
807 while(1) {
808 unsigned long long comp;
809 if (sysfs_get_ll(sra, NULL, "sync_completed", &comp)<0) {
810 sleep(5);
811 break;
812 }
813 if (comp >= nstripe)
814 break;
815 sleep(1);
816 }
817
818 /* invalidate superblocks */
819 memset(&bsb, 0, sizeof(bsb));
820 for (i=odisks; i<d ; i++) {
821 lseek64(fdlist[i], (offsets[i]+last_block)<<9, 0);
822 if (write(fdlist[i], &bsb, sizeof(bsb)) < 0) {
823 fprintf(stderr, Name ": %s: failed to invalidate metadata for raid disk %d\n",
824 devname, i);
825 }
826 }
827
828 /* unsuspend. */
829 sysfs_set_num(sra, NULL, "suspend_lo", last_block);
830
831 for (i=0; i<d; i++)
832 if (fdlist[i] >= 0)
833 close(fdlist[i]);
834 free(fdlist);
835 free(offsets);
836 if (backup_file)
837 unlink(backup_file);
838
839 printf(Name ": ... critical section passed.\n");
840 break;
841 }
842 return 0;
843
844
845 abort_resume:
846 sysfs_set_num(sra, NULL, "suspend_lo", last_block);
847 abort:
848 for (i=0; i<array.nr_disks; i++)
849 if (fdlist[i] >= 0)
850 close(fdlist[i]);
851 free(fdlist);
852 free(offsets);
853 if (backup_file)
854 unlink(backup_file);
855 return 1;
856
857 }
858
859 /*
860 * If any spare contains md_back_data-1 which is recent wrt mtime,
861 * write that data into the array and update the super blocks with
862 * the new reshape_progress
863 */
864 int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt, char *backup_file)
865 {
866 int i, j;
867 int old_disks;
868 int err = 0;
869 unsigned long long *offsets;
870
871 if (info->delta_disks < 0)
872 return 1; /* cannot handle a shrink */
873 if (info->new_level != info->array.level ||
874 info->new_layout != info->array.layout ||
875 info->new_chunk != info->array.chunk_size)
876 return 1; /* Can only handle change in disks */
877
878 old_disks = info->array.raid_disks - info->delta_disks;
879
880 for (i=old_disks-(backup_file?1:0); i<cnt; i++) {
881 void *super = NULL;
882 struct mdinfo dinfo;
883 struct mdp_backup_super bsb;
884 char buf[4096];
885 int fd;
886
887 /* This was a spare and may have some saved data on it.
888 * Load the superblock, find and load the
889 * backup_super_block.
890 * If either fail, go on to next device.
891 * If the backup contains no new info, just return
892 * else restore data and update all superblocks
893 */
894 if (i == old_disks-1) {
895 fd = open(backup_file, O_RDONLY);
896 if (fd<0)
897 continue;
898 } else {
899 fd = fdlist[i];
900 if (fd < 0)
901 continue;
902 if (st->ss->load_super(st, fd, &super, NULL))
903 continue;
904
905 st->ss->getinfo_super(&dinfo, super);
906 free(super); super = NULL;
907 if (lseek64(fd,
908 (dinfo.data_offset + dinfo.component_size - 8) <<9,
909 0) < 0)
910 continue; /* Cannot seek */
911 }
912 if (read(fd, &bsb, sizeof(bsb)) != sizeof(bsb))
913 continue; /* Cannot read */
914 if (memcmp(bsb.magic, "md_backup_data-1", 16) != 0)
915 continue;
916 if (bsb.sb_csum != bsb_csum((char*)&bsb, ((char*)&bsb.sb_csum)-((char*)&bsb)))
917 continue; /* bad checksum */
918 if (memcmp(bsb.set_uuid,info->uuid, 16) != 0)
919 continue; /* Wrong uuid */
920
921 if (info->array.utime > __le64_to_cpu(bsb.mtime) + 3600 ||
922 info->array.utime < __le64_to_cpu(bsb.mtime))
923 continue; /* time stamp is too bad */
924
925 if (__le64_to_cpu(bsb.arraystart) != 0)
926 continue; /* Can only handle backup from start of array */
927 if (__le64_to_cpu(bsb.length) <
928 info->reshape_progress)
929 continue; /* No new data here */
930
931 if (lseek64(fd, __le64_to_cpu(bsb.devstart)*512, 0)< 0)
932 continue; /* Cannot seek */
933 /* There should be a duplicate backup superblock 4k before here */
934 if (lseek64(fd, -4096, 1) < 0 ||
935 read(fd, buf, 4096) != 4096 ||
936 memcmp(buf, &bsb, sizeof(bsb)) != 0)
937 continue; /* Cannot find leading superblock */
938
939 /* Now need the data offsets for all devices. */
940 offsets = malloc(sizeof(*offsets)*info->array.raid_disks);
941 for(j=0; j<info->array.raid_disks; j++) {
942 if (fdlist[j] < 0)
943 continue;
944 if (st->ss->load_super(st, fdlist[j], &super, NULL))
945 /* FIXME should be this be an error */
946 continue;
947 st->ss->getinfo_super(&dinfo, super);
948 free(super); super = NULL;
949 offsets[j] = dinfo.data_offset;
950 }
951 printf(Name ": restoring critical section\n");
952
953 if (restore_stripes(fdlist, offsets,
954 info->array.raid_disks,
955 info->new_chunk,
956 info->new_level,
957 info->new_layout,
958 fd, __le64_to_cpu(bsb.devstart)*512,
959 0, __le64_to_cpu(bsb.length)*512)) {
960 /* didn't succeed, so giveup */
961 return -1;
962 }
963
964 /* Ok, so the data is restored. Let's update those superblocks. */
965
966 for (j=0; j<info->array.raid_disks; j++) {
967 if (fdlist[j] < 0) continue;
968 if (st->ss->load_super(st, fdlist[j], &super, NULL))
969 continue;
970 st->ss->getinfo_super(&dinfo, super);
971 dinfo.reshape_progress = __le64_to_cpu(bsb.length);
972 st->ss->update_super(&dinfo, super, "_reshape_progress",NULL,0, 0, NULL);
973 st->ss->store_super(st, fdlist[j], super);
974 free(super);
975 }
976
977 /* And we are done! */
978 return 0;
979 }
980 return err;
981 }
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